PURE-TONE THRESHOLD PREDICTION BY 80-HZ AMPLITUDE-MODULATION FOLLOWING RESPONSE

The usefulness of 80-Hz amplitude-modulation following response (AMFR) detected by phase spectral analysis to predict the hearing threshold during sleep was evaluated in 20 normal adults, 8 normal children and 37 children with hearing impairment. The onset effect of tonal stimulu s on 80-Hz steady state response was studied in normal adults during s leep and a threshold of 80-Hz AMFR detected by phase spectral analysis was compared with that of ABR elicited by tone pips in children durin g sleep. Although 80-Hz AMFR is not appropriate for the assessment of hearing in adults, it appears useful for evaluating hearing in young c hildren during sleep. Hearing prediction by 80-Hz AMFR appears to be m ore accurate than that by ABR elicited with tone pips. The onset effec t of stimulus on 80-Hz AMFR with modulation depth of 95% was less than 80-Hz SSR evoked by clicks.